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<?php $a=array(); $a[]=array( 'a' => 'a0', 'b' => 'b0' ); foreach($a as $i){ $i['c']='d'; } print_r($a);
Output for 4.3.0 - 7.2.0
Array ( [0] => Array ( [a] => a0 [b] => b0 ) )